Failed Deal Roils South Africa Opposition

Antiapartheid Veteran Pulls Out as Party's Candidate

JOHANNESBURG—The leader of South Africa's top opposition party on Monday said she had made a mistake recruiting antiapartheid veteran Mamphela Ramphele to be her party's presidential candidate, after a short-lived alliance collapsed over the weekend.

"Sometimes in politics you have to take a risk," said Helen Zille, leader of the Democratic Alliance, the center-right party that is the country's biggest opposition group....